175Pc High Temp Silicone Rubber Plug Kit Powder Coating Custom Paint Masking Tapered Stoppers Mask off holes during powder coating, painting, hydro dipping, media blasting, etc. Heat proof up to 600 degrees F and resistant to most chemicals for extreme conditions. Assortment of 5 different tapered plugs to fit any threaded or unthreaded hole from 1/32" to 3/8" ID Many uses around the home, garage, auto shop, classroom, laboratory, machine shop refinishing shop, etc. Great for plugging brake, fuel, transmission, coolant and vacuum lines and ports